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Three-Phase Hybrid Multilevel Inverter Based on Half-Bridge Modules

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3 Author(s)
Batschauer, A.L. ; Dept. of Electr. Eng., Santa Catarina State Univ., Joinville, Brazil ; Mussa, S.A. ; Heldwein, M.L.

A novel three-phase hybrid multilevel converter is proposed for medium-voltage applications. The converter employs a conventional three-phase voltage source inverter (VSI) linking series connected half-bridge modules at each phase. With the proposed connection, a large portion of energy can be processed by the VSI by employing a single multi-pulse rectifier, while smaller power shares are processed within the half-bridge modules. Thus, the requirements for galvanically insulated dc sources are reduced. Modularity is naturally achieved. A modulation scheme for a four-level version is proposed and analyzed in detail. This scheme allows unidirectional power flow in all dc sources and, consequently, enables diode bridges to be employed in the rectification input stage for unidirectional applications.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 2 )

Date of Publication:

Feb. 2012

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